The Cassini spacecraft catches a glimpse of Janus, an irregularly shaped moon. Lacking sufficient gravity to pull itself into a round shape, Janus has had its lumpy primordial shape only slightly modified by impacts since its formation.

NASA's Cassini spacecraft looks past the cratered south polar area of Saturn's moon Rhea to spy the moon Dione and the planet's rings in the distance. Dione's 'wispy' terrain can be seen on the trailing hemisphere of that moon.

Saturn's rings appear curved in this view from NASA's Cassini spacecraft, which also shows the moon Janus in the distance. Janus is at the bottom of the image and is farther from the spacecraft than the rings are.

Saturn's rings appear curved in this view from NASA's Cassini spacecraft, which also shows the moon Janus in the distance. Janus is at the bottom of the image and is farther from the spacecraft than the rings are.

Saturn's moon Epimetheus passes in front of Janus in this "mutual event" (one moon passing close to or in front of another) chronicled by NASA's Cassini spacecraft. These three images were each taken a little more than a minute apart.

Sunlight passing through the Cassini Division between Saturn's A and B rings sweeps across and illuminates the surface of the moon Janus in this image captured by NASA's Cassini spacecraft. Go to the Photojournal to view the animation.